Modulation signal analysis apparatus

ABSTRACT

An analysis operation section uses a digital signal converted by an A/D converter, and performs frequency analysis for a modulation signal and modulation analysis for the modulation signal selected by a signal selection circuit in order to modulate/analyze a digital signal level of the modulation signal as an analysis object outputted from a level converter. A controller instructs the analysis operation section to execute an analysis instruction inputted via an operation input section, sends a selection instruction to the signal selection circuit in accordance with a modulation type of the inputted modulation signal, and sets a bandwidth of an RBW filter in accordance with the modulation type when the modulation signal having a band limited by the RBW filter is selected as the modulation signal inputted to the A/D converter, and the modulation analysis instruction is inputted.

This application is a U.S. National Phase Application under 35 USC 371of International Application PCT/JP00/07842 (not published in English)filed Nov. 8, 2000.

TECHNICAL FIELD

The present invention relates to a modulation signal analysis apparatus,particularly to a modulation signal analysis apparatus for analyzingvarious modulation signals for use in various communication systemsincluding a mobile communication system.

BACKGROUND ART

In general, mobile communication systems are well known throughout theworld, such as various types of cellular phone and car phone, as well asthe simple Japanese personal handyphone system (PHS).

In these mobile communication systems, it is very important tomeasure/analyze the various properties of a modulation signaltransmitted/received between a base station and a mobile station(portable terminal), and thereby confirm that the properties are in anallowable range of a predetermined standard.

The measurement/analysis of the modulation signal is roughly dividedinto frequency analysis and modulation analysis.

First, for the frequency analysis, an occupied frequency range of themodulation signal, transmission power in each frequency, adjacentchannel leak power, spurious property, and the like are analyzed.

Moreover, modulation analysis differs with the type of modulationsystem, however, the items which are analyzed are the modulation factor,modulation precision, and the like.

FIG. 2 shows a constitution of a conventional modulation signal analysisapparatus in which the frequency analysis and modulation analysis can beperformed with respect to the modulation signal in this manner.

That is, as shown in FIG. 2, a modulation signal a inputted via an inputterminal 1 is inputted to a multiplier (mixer) 2 a of a frequencysweeper 2.

A sweep frequency signal b is applied to the multiplier 2 a from a sweeposcillator 2 b.

Moreover, the modulation signal outputted from the frequency sweeper 2is limited in band by a band pass filter (BPF) 3, and subsequentlyinputted to a multiplier (mixer) 4 a of a frequency converter 4.

A local oscillation signal is applied to the multiplier 4 a from a localoscillator 4 b.

Therefore, the frequency converter 4 converts a center frequency f_(C)of the modulation signal outputted from the BPF 3 to an intermediatefrequency f_(I).

Moreover, a modulation signal a₁ having the center frequency f_(C)converted to the intermediate frequency f_(I) by the frequency converter4 is inputted to a resolution bandwidth (RBW) filter 5.

Here, as shown in the frequency characteristics diagram of FIG. 6, theRBW filter 5 is controlled with a bandwidth (resolution bandwidth) RBWdetermined by a resolution in which a frequency component in themodulation signal as an analysis object is set.

The resolution bandwidth RBW is set centering on the center frequencyf_(C) equal to the intermediate frequency f_(I) of the frequencyconverter 4.

After the frequency component is limited in several bands by the RBWfilter 5, the modulation signal a₁ is subjected to logarithm conversionby a logarithm (LOG) converter 6, and a level signal d of a decibel (dB)unit with the frequency on a time axis (abscissa) is obtained.

The level signal d outputted from the LOG converter 6 is inputted to avideo bandwidth (VBW) filter 7.

The VBW filter 7 removes noise included in the level signal d with thefrequency on the time axis (abscissa).

Moreover, the level signal d whose noise is removed by the VBW filter 7is converted to a digital level signal d₁ by an analog/digital (A/D)converter 8, and subsequently inputted to a changeover section 9.

On the other hand, the modulation signal a₁ whose center frequency f_(C)is converted to the intermediate frequency f_(I) by the frequencyconverter 4, that is, the modulation signal a₁ before the frequencycomponent is limited in several bands by the RBW filter 5 is convertedto a digital modulation signal a₂ by an A/D converter 11, andsubsequently inputted to the changeover section 9.

The changeover section 9 transmits one signal designated by a controller10 out of the inputted level signal d₁ and modulation signal a₂ to awaveform memory 11.

The waveform memory 11 stores/retains the inputted level signal d₁ orthe modulation signal a₂.

Moreover, when the digital level signal d₁ is stored in the waveformmemory 11, an analysis operation section 12 uses the digital levelsignal d₁ to perform frequency analysis.

Furthermore, when the digital modulation signal a₂ is stored in thewaveform memory 11, the analysis operation section 12 uses the digitalmodulation signal a₂ to perform modulation analysis.

Therefore, a transmission power property calculator 13 a, adjacentchannel leak power calculator 13 b, spurious property calculator 13 c,and the like for performing the frequency analysis are disposed in theanalysis operation section 12.

Furthermore, a modulation factor calculator 14 a, modulation precisioncalculator 14 b, and the like for performing the modulation analysis aredisposed in the analysis operation section 12.

Property calculation results in the respective calculators 13 a, 13 b,13 c, 14 a, 14 b of the analysis operation section 12 are displayed in adisplay 15.

Moreover, an operation input section 16 has a function of inputting theaforementioned various measurement items and measurement conditions tothe controller 10 by a measuring person (operator).

Furthermore, the controller 10 switches/controls the changeover section9 in accordance with the measurement (analysis) items inputted via theoperation input section 16, and additionally controls a sweep operationof the frequency sweeper 2.

Additionally, the controller 10 selects and starts the respectiveoperators 13 a, 13 b, 13 c, 14 a, 14 b of the analysis operation section12.

Moreover, if necessary, the controller 10 changes a bandwidth RBW of theRBW filter 5.

In the modulation signal analysis apparatus constituted in this manner,the pass bandwidth (resolution bandwidth) RBW shown in FIG. 6 in the RBWfilter 5 indicates a frequency resolution in a case in which themodulation signal is subjected to the frequency analysis as shown inFIGS. 3A, 3B.

Here, FIG. 3A shows a waveform of the level signal d before beinginputted to the VBW filter 7.

Moreover, FIG. 3B shows the waveform of the level signal d before beingoutput from the VBW filter 7.

The VBW filter 7 removes high-frequency noise included in the levelsignal d in this manner.

FIG. 4A shows transmission power levels of respective channels (n−1), n,(n+1) obtained by the transmission power property calculator 13 a of theanalysis operation section 12, and leak powers to adjacent channels ofthe respective channels (n−1), n, (n+1) obtained by the adjacent channelleak power calculator 13 b of the analysis operation section 12.

Moreover, FIG. 4B shows a spurious property obtained by the spuriousproperty calculator 13 c of the analysis operation section 12.

FIG. 5 shows the modulation precision obtained by the modulationprecision calculator 14 b of the analysis operation section 12.

In an example shown in FIG. 5, a π/4 quadrature phase shift keying(QPSK) modulation signal is used as the object of analysis of themodulation signal.

In this case, an amplitude error (A_(S)−A) and phase error α(=θ_(S)−θ)of an amplitude A and phase θ of a symbol position P measured in anin-phase component (I)/orthogonal component (Q) coordinate system froman amplitude A_(S) and phase θ_(S) of a reference symbol position P_(S)are obtained.

As shown in FIGS. 4A and 4B, in order to subject the inputted modulationsignal a to frequency analysis, it is necessary to convert themodulation signal a₁ to the level signal d with the frequency on thetime axis (abscissa).

On the other hand, as shown in FIG. 5, in order to subject the inputtedmodulation signal a to modulation analysis, it is necessary to directlyanalyze the waveform of the modulation signal a₁ and calculate base bandsignal components I, Q included in the modulation signal a₁. Therefore,the modulation signal a₁ before conversion to the level signal d needsto be used.

Moreover, in order to perform modulation analysis, respective signallevels (amplitudes) in respective frequencies in the bandwidth in themodulation signal a₁ are preferably substantially constant.

Therefore, when frequency analysis is performed on the inputtedmodulation signal a, the measuring person (operator) operates theoperation input section 16 and selects the digital level signal d₁ bythe changeover section 9.

Moreover, when the modulation analysis is performed on the inputtedmodulation signal a, the measuring person (operator) operates theoperation input section 16, selects the digital modulation signal a₂ bythe changeover section 9, and additionally stops a sweep operation ofthe frequency sweeper 2.

When simple signal changeover means is disposed in this manner,frequency analysis and modulation analysis can be performed with respectto the inputted modulation signal a with one modulation signal analysisapparatus.

However, there is the following problem yet to be solved even in themodulation signal analysis apparatus shown in FIG. 2.

That is, depending upon the modulation system of the modulation signal aas the analysis object, the modulation signal a subjected tomulti-channel multiplexing has a predetermined bandwidth centering onthe center frequency f_(C) (=intermediate frequency f_(I)).

Therefore, when modulation analysis is performed on the modulationsignal a, and excessive band limitation is performed on the modulationsignal a, respective base band signals I, Q cannot be correctlydemodulated from the modulation signal. Therefore, the modulationprecision cannot be correctly measured as shown in FIG. 5.

In order to prevent such situations occurring, in the conventional art,after the modulation signal a₁ with the center frequency f_(C) outputtedfrom the frequency converter 4 and fixed to the intermediate frequencyf_(I) is subjected to the band limitation with a fixed bandwidth,modulation analysis is performed.

However, for example, in mobile communication systems such as cellularphones, various modulation systems are developed for the modulationsystem of the modulation signal transmitted/received between the basestation and each mobile station (portable terminal), and some of thesystems are implemented.

The bandwidth (BW) used largely differs with the respective modulationsystems.

For example, as shown in FIG. 6, the bandwidth (BW) used in generalpersonal digital cellular (PDC) phones in Japan is 30 kHz.

Moreover, the bandwidth in the aforementioned PHS and global system formobile communication (GMS) in Europe is 300 kHz.

Furthermore, the bandwidth in a code division multiple access (CDMA)using a spectrum diffusion system to rapidly increase the number ofchannels included in one modulation signal is 1.5 MHz, and thebandwidths in W-CDMA are 4 MHz, 8 MHz, 16 MHz, . . . .

In this manner, the bandwidth (BW) for use in the CDMA and W-CDMA usingthe spectrum diffusion system to rapidly increase the number of channelsincluded in one modulation signal rapidly increases.

Therefore, the bandwidth for performing pass band control on themodulation signal cannot univocally be determined.

Moreover, when a filter for exclusive use in performing the modulationanalysis is disposed, the manufacture cost of the modulation signalanalysis apparatus is much increased.

BRIEF SUMMARY OF THE INVENTION

The present invention has been developed in consideration of theaforementioned situation, and an object thereof. Is to providemodulation signal analysis apparatus in which an RBW filter isselectively used for modulation analysis in accordance with a modulationtype of a modulation signal as an analysis object, and thereby frequencyanalysis and modulation analysis can be performed on various types ofmodulation signals with a high precision by a simple constitution.

According to one aspect of the present invention, there is provided amodulation signal analysis apparatus comprising:

-   -   a frequency converter (4) for converting a frequency of a        modulation signal (a) inputted from the outside to an        intermediate frequency;    -   an RBW filter (5) for receiving the modulation signal outputted        from the frequency converter and limiting a frequency component        with a bandwidth determined by a designated resolution;    -   a level converter (6) for converting the modulation signal        having a band limited by the RBW filter to a digital level        signal (d) to perform frequency analysis;    -   a signal selection circuit (17) for selecting either one        modulation signal from the modulation signal (a1) before having        the band limited by the RBW filter and the modulation signal        (a3) having the band limited by the RBW filter;    -   an A/D converter (11) for receiving the modulation signal        selected by the signal selection circuit and converting the        modulation signal to a digital signal;    -   an operation input section (19) for operating/inputting a        frequency analysis instruction for the modulation signal, a        modulation analysis instruction for the modulation signal, and a        modulation type of the modulation signal;    -   an analysis operation section (12) for using the digital signal        converted by the A/D converter and performing frequency analysis        for the modulation signal and modulation analysis for the        modulation signal selected by the signal selection circuit in        order to modulate/analyze a level signal outputted from the        level converter; and    -   a controller (18) for instructing the analysis operation section        to execute the analysis instruction operated/inputted via the        operation input section, sending a selection instruction to the        signal selection circuit in accordance with the modulation type        of the operated/inputted modulation signal, and setting the        bandwidth of the RBW filter in accordance with the modulation        type of the modulation signal when the modulation signal having        the band limited by the RBW filter is selected as the modulation        signal inputted to the A/D converter, and the modulation        analysis instruction for the modulation signal is inputted to        the operation input section.

In the modulation signal analysis apparatus constituted in this manner,a measuring person (operator) designates whether frequency analysis ormodulation analysis is performed by the operation input section.

Here, when modulation analysis is designated, the type of modulationsignal is further operated/inputted.

Then, the modulation signal having the band limited by the RBW filter orthe modulation signal having the band not limited by the RBW filter isautomatically selected as the modulation signal inputted to the analysisoperation section in accordance with the modulation type of themodulation signal.

For example, the modulation signal before being input to the RBW filteris selected with respect to the modulation type of the modulation signalwith a broad bandwidth such as CDMA.

Moreover, the modulation signal outputted from the RBW filter isselected with respect to the modulation type of the modulation signalwith a narrow bandwidth such as PDC.

Therefore, for the modulation signal with a narrow bandwidth, such asPDC, high-frequency and low-frequency noise components widely deviatingfrom the bandwidth are removed, and modulation analysis precision isenhanced.

On the other hand, for a modulation signal with a broad bandwidth suchas CDMA, since modulation analysis is performed in a broad bandwidthstate, the modulation analysis precision is enhanced.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram showing a schematic constitution of amodulation signal analysis apparatus according to one embodiment of thepresent invention.

FIG. 2 is a block diagram showing the schematic constitution of aconventional modulation signal analysis apparatus.

FIGS. 3A, 3B are diagrams showing a signal waveform of a level signaloutputted from a LOG converter in the modulation signal analysisapparatus of FIG. 2.

FIGS. 4A, 4B are diagrams showing transmission power and spuriousproperties measured by the modulation signal analysis apparatus of FIG.2.

FIG. 5 is a diagram showing modulation precision measured by themodulation signal analysis apparatus of FIG. 2.

FIG. 6 is a diagram showing frequency properties of an RBW filterincorporated in the modulation signal analysis apparatus of FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

One embodiment of the present invention will be described hereinafterwith reference to the drawings.

FIG. 1 is a block diagram showing a schematic constitution of amodulation signal analysis apparatus according to one embodiment of thepresent invention.

In FIG. 1, the same elements as those of the conventional modulationsignal analysis apparatus shown in FIG. 2 are denoted by the samereference numerals, and a detailed description of the overlappingsections is omitted.

In the modulation signal analysis apparatus according to one embodimentof the present invention, a modulation signal a₁ in which a centerfrequency f_(C) outputted from a frequency converter 4 is set to anintermediate frequency f_(I) of the frequency converter 4 is inputted toan RBW filter 5, and additionally to one input terminal a of a signalselection circuit 17.

Moreover, a modulation signal a₃ whose bandwidth is limited to RBW bythe RBW filter 5 is inputted to the other input terminal b of the signalselection circuit 17.

The signal selection circuit 17 switches/connects a common terminal c toeither one of input terminals a, b to which the modulation signals a₁,a₃ are inputted based on a selection instruction from a controller 18.

Either one of the modulation signals a₁, a₃ outputted via the commonterminal c of the signal selection circuit 17 is converted to a digitalmodulation signal a₄ by an A/D converter 11 and inputted to one inputterminal of a changeover section 9.

Similarly as FIG. 1, a digital level signal d₁ is inputted to the otherinput terminal of the changeover section 9 while the frequency outputtedfrom an A/D converter 8 is on a time axis (abscissa).

The changeover section 9 switches the digital modulation signal a₄ orthe digital level signal d₁ to be written in a waveform memory 10 basedon a switch instruction from the controller 18.

Moreover, similarly as in FIG. 1, a frequency sweeper 2, frequencyconverter 4, and LOG converter 6 constitute a conversion circuit inwhich the modulation signal a₃ passed through the RBW filter 5 is LOGconverted and converted to a level signal d with the frequency on thetime axis (abscissa) to perform frequency analysis.

Moreover, similarly as in FIG. 1, a transmission power propertycalculator 13 a, adjacent channel leak power calculator 13 b, spuriousproperty calculator 13 c, and the like for performing the frequencyanalysis are disposed in the analysis operation section 12.

Furthermore, a modulation factor calculator 14 a, modulation precisioncalculator 14 b, and the like for performing the modulation analysis aredisposed in the analysis operation section 12.

Property calculation results in the respective calculators 13 a, 13 b,13 c, 14 a, 14 b of the analysis operation section 12 are displayed in adisplay 15.

In an operation input section 19 constituting a part of an operationpanel, a multiplicity of measurement item buttons 20 of a transmissionpower measurement, adjacent channel leak power measurement, spuriousmeasurement, modulation factor measurement, modulation precisionmeasurement, and the like, and a plurality of modulation type buttons 21of PDC, PHS, CDMA, W-CDMA, and the like are disposed.

Furthermore, a display screen 15 a of the display is exposed in theoperation panel.

The operation input section 19 transmits a measurement item designatedwith the measurement item button 20 and a modulation type designatedwith the modulation type button 21 by the measuring person (operator) tothe controller 18.

Here, a measurement item setter 18 a and modulation type setter 18 b aredisposed in the controller 18.

In this case, the modulation type setter 18 b transmits a selectioninstruction of the modulation signal a₃ to the signal selection circuit17 when the modulation type with a narrow use bandwidth such as PDC andPHS is inputted from the operation input section 19.

As a result, the modulation signal a₃ outputted from the RBW filter 5 isconverted to the digital modulation signal a₄ by the A/D converter 11and inputted to the changeover section 9.

Moreover, the modulation type setter 18 b transmits the selectioninstruction of the modulation signal a₁ to the signal selection circuit17 when the modulation type with a broad use bandwidth such as CDMA andW-CDMA is inputted from the operation input section 19.

As a result, the modulation signal a₁ before inputted to the RBW filter5 is converted to the digital modulation signal a₄ by the A/D converter11 and inputted to the changeover section 9.

Furthermore, the modulation type setter 18 b sets a pre-designated RBWto the RBW filter 5 with respect to the modulation type designated fromthe operation input section 19.

Moreover, the measurement item setter 18 a switches/controls thechangeover section 9 to change an input for the waveform memory 10 tothe side of the digital level signal d₁, and sends a start instructionto the frequency sweeper 2 when the respective measurement items such asthe transmission power measurement, adjacent channel leak powermeasurement, and spurious measurement for the frequency analysis areinputted from the operation input section 19.

Subsequently, the measurement item setter 18 a sends an executioninstruction of the calculator corresponding to the measurement item tothe analysis operation section 12.

Moreover, the measurement item setter 18 a switches/controls thechangeover section 9 to change the input for the waveform memory 10 tothe side of the digital modulation signal a₄, and sends an operationstop instruction to the frequency sweeper 2 when the respectivemeasurement items such as the modulation factor measurement andmodulation precision measurement for the modulation analysis areinputted from the operation input section 19.

Subsequently, the measurement item setter 18 a sends the executioninstruction of the calculator corresponding to the measurement item tothe analysis operation section 12.

In the modulation signal analysis apparatus constituted in this manner,when various measurements are performed in response to the modulationsignal a inputted via the input terminal 1, the measuring person(operator) selects the measurement item with the measurement item button20, and the modulation type with the modulation type button 21 from theoperation input section 19.

Then, the controller 18 automatically sets optimum measurementconditions from the selected measurement item and modulation type.

To be specific, when the measurement item is a measurement itembelonging to frequency analysis, the level signal d₁ with the frequencytaken via the changeover section 9 on the time axis is used to performfrequency analysis corresponding to the selected measurement item in theanalysis operation section 12, and an analysis result isdisplayed/outputted to the display 15.

Moreover, when the measurement item is a measurement item belonging tothe modulation analysis, the digital modulation signal a₄ taken via thechangeover section 9 is used to perform frequency analysis correspondingto the selected measurement item in the analysis operation section 12,and the analysis result is displayed/outputted to the display 15.

Furthermore, when the modulation type is PDC, PHS, or the like with anarrow use bandwidth, the modulation signal a₃ with the band controlledby the RBW filter 5 is A/D converted and the digital modulation signala₄ is used.

Therefore, in this case, since high-frequency and low-frequency noisecomponents deviating far from the bandwidth in the modulation signal aare removed, modulation analysis precision is enhanced.

Moreover, when the modulation type is CDMA, W-CDMA, or the like with abroad use bandwidth, the modulation signal a₁ before subjected to bandcontrol by the RBW filter 5 is A/D converted and the digital modulationsignal a₄ is used.

Therefore, in this case, since modulation analysis is performed with thebroad bandwidth in the modulation signal a, the modulation analysisprecision is enhanced.

Furthermore, when modulation analyses such as the modulation factormeasurement and modulation precision measurement are performed, the RBWfilter 5 already incorporated in the modulation signal analysisapparatus is selectively used in accordance with the modulation type ofthe modulation signal as the analysis object.

Therefore, the manufacture cost does not largely rise when compared tothe conventional modulation signal analysis apparatus shown in FIG. 2.

As described above, in the modulation signal analysis apparatus of thepresent invention, when the modulation analysis such as the modulationfactor measurement and modulation precision measurement are performed,band limitation is performed with the RBW filter before the modulationanalysis in accordance with the modulation type of the modulation signalas the analysis object.

Therefore, according to the present invention, a modulation signalanalysis apparatus can be provided which can perform highly accuratefrequency analysis and modulation analysis for various types ofmodulation signals, using a simple construction.

1. A modulation signal analysis apparatus comprising: a frequencyconverter for converting a frequency of a modulation signal inputtedfrom outside to an intermediate frequency; a resolution bandwidth (RAW)filter for receiving the modulation signal outputted from said frequencyconverter and limiting a frequency component with a bandwidth determinedby a designated resolution; a level converter for converting themodulation signal having a band limited by said RBW filter to a digitallevel signal to perform frequency analysis; a signal selection circuitfor selecting either one modulation signal from the modulation signalbefore having the band limited by said RBW filter or the modulationsignal after having the band limited by said RBW filter; an A/Dconverter for receiving the modulation signal selected by said signalselection circuit and converting the modulation signal to a digitalsignal; an operation input section for operating and inputting outside afrequency analysis instruction for said modulation signal, a modulationanalysis instruction for said modulation signal, and a modulation typeof said modulation signal; an analysis operation section for using thedigital signal converted by said A/D converter and performing frequencyanalysis for said modulation signal and modulation analysis for themodulation signal selected by the signal selection circuit in order tomodulate and analyze a level signal outputted from said level converter;and a controller for instructing said analysis operation section toexecute the analysis instruction operated and inputted via saidoperation input section, sending a selection instruction to said signalselection circuit in accordance with the modulation type of the operatedand inputted modulation signal, and setting the bandwidth of said RBWfilter in accordance with the modulation type of said modulation signalwhen the modulation signal having the band limited by said RBW filter isselected as the modulation signal inputted to said A/D converter, andthe modulation analysis instruction for said modulation signal isinputted to said operation input section.
 2. The modulation signalanalysis apparatus according to claim 1, wherein said controller sendsthe selection instruction of the modulation signal having the bandlimited by said RBW filter to said signal selection circuit when themodulation type with a narrow use bandwidth is inputted from saidoperation input section.
 3. The modulation signal analysis apparatusaccording to claim 1, wherein said controller sends the selectioninstruction of the modulation signal before subjected to the bandlimitation by said RBW filter to said signal selection circuit when themodulation type with a broad use bandwidth is inputted from saidoperation input section.
 4. The modulation signal analysis apparatusaccording to claim 2, wherein a Personal Digital Cellular (PDC) orPersonal Handyphone System (PHS) signal is inputted as the modulationtype with the narrow use bandwidth to said controller from saidoperation input section.
 5. The modulation signal analysis apparatusaccording to claim 3, wherein a Code Division Multiple Access (CDMA) orWideband Code Division Multiple Access (W-CDMA) signal is inputted asthe modulation type with the broad use bandwidth to said controller fromsaid operation input section.
 6. The modulation signal analysisapparatus according to claim 1, wherein said controller comprises: amodulation type setting section for sending the selection instruction tosaid signal selection circuit in accordance with the modulation typeinputted from said operation input section; and a measurement itemsetting section for sending an execution instruction for calculating aproperty corresponding to a measurement item to said analysis operationsection when the measurement item is inputted from said operation inputsection.
 7. The modulation signal analysis apparatus according to claim1, wherein said operation input section comprises: a measurement itemselection button for selecting a desired measurement item when a desiredmeasurement is executed in response to said modulation signal inputtedfrom the outside; and a modulation type selection button for selectingthe modulation type of said modulation signal inputted from the outside.8. The modulation signal analysis apparatus according to claim 7,wherein said modulation type selection button comprises: a PDC selectionbutton; a PHS selection button; a CDMA selection button; and a W-CDMAselection button.
 9. The modulation signal analysis apparatus accordingto claim 1, wherein said analysis operation section comprises: atransmission power property calculator; an adjacent channel teak powercalculator; and a spurious property calculator for performing frequencyanalysis.
 10. The modulation signal analysis apparatus according toclaim 1, wherein said analysis operation section comprises: a modulationfactor calculator; and a modulation precision calculator for performingthe modulation analysis.